Article directory
Password-free login
1. First generate a secret key pair (public key and private key)
ssh-keygen
2. Check whether the generation is successful
ll /root/.ssh
3. Copy A’s own public key and append it to B’s authorization list file authorized_keys
ssh-copy-id 192.168.1.100
4. Password-free ssh login
ssh 192.168.1.100
pssh installation
Download address: https://pypi.org/project/pssh/#files
1. Install dependency packages
yum install -y make gcc gcc++ python-devel python-pip
2. Upload the installation package and install pssh
tar zxvf pssh-2.3.1.tar.gz
cd pssh-2.3.1
python setup.py install
pssh use
pssh tool usage
| app | Instructions for use |
|---|---|
| pssh | Run commands in parallel on multiple hosts |
| pscp | Copy files to multiple hosts in parallel |
| prsync | Efficiently synchronize files to multiple hosts through the rsync protocol |
| pslurp | Copy files from multiple remote hosts to the local machine in parallel |
| books | Kill processes on multiple remote machines in parallel |
pssh tool parameters
| parameter | illustrate |
|---|---|
| -h | List of remote hosts to execute the command; or -H user@ip:port; file content format [user@]host[:port] |
| -l | The username of the remote machine |
| -P | Output execution information during execution |
| -p | Maximum number of connections allowed at one time |
| -o | Redirect output to a file |
| -e | Redirect execution errors to a file |
| -t | Set the timeout for command execution |
| -A | Prompt for password and pass password to ssh |
| -O | To set the specific configuration of ssh parameters, refer to the ssh_config configuration file. |
| -x | Pass multiple SSH commands. Multiple commands are separated by spaces and enclosed in quotes. |
| -X | Same as -x but only one command can be passed at a time |
| -i | Display standard output and standard error after each host completes execution |
pssh usage example
1. pssh executes commands in parallel on multiple hosts
# 获取每台机器上的时间，先在管理机上新建 ip.txt
pssh -p 2 -i -h /root/test/ip.txt "date"
2. pscp copies files to multiple machines in parallel
# 将本地的 /root/kaishi.sh 文件复制到目标服务器的 /tmp/ 目录下
pscp -h /root/test/pssh.txt /root/kaishi.sh /tmp/
# 验证文件是否已经成功复制过去
pssh -p 2 -i -h /root/test/pssh.txt "ls /tmp/kaishi.sh"
3. prsync uses the rsync protocol to synchronize files from the local computer to the remote host
# 将本地的 /etc/sysconfig 目录递归同步到目标服务器的 /tmp/ 目录下
prsync -h /root/test/pssh.txt -l -a -r /etc/sysconfig /tmp/test/
# 验证文件是否已经成功同步过去
pssh -p 2 -i -h /root/test/pssh.txt "ls /tmp/test/"
4. pslurp copies files from remote host to local host
# 将目标服务器的 /tmp/*.log 格式的文件复制到本地的 /tmp 目录下，并更名为 test1.log 格式
pslurp -p 2 -h /root/test/pssh.txt -L /tmp -l root /tmp/*.log test1.log
# 在 /tmp/ 目录下即可看见以远端IP地址命名为目录，目录中存放复制过来的文件
ll /tmp/
5. pnuke kills the process on the remote host in parallel and kills the nginx process on the remote server
# 查看远端nginx状态
pssh -p 2 -i -h /root/test/pssh.txt "lsof -i:80"
# 杀死远端nginx进程
pnuke -p 2 -h /root/test/pssh.txt nginx